Here’s the undated plan of the eastern entry of the Brent where it meets the Thames, at a time when the Swan’s Neck loop was intact, but with a ‘new cut’ dug across the point where the loops are closest, to avoid boats having to travel up and around and down again, through what later became known as Soaphouse Creek [after TB Rowe soap manufacturers who owned this bit and built their soap factory here].
This dates well before the GJCC Act of 1973, the deposited plan of which, while it does not extend to the Thames itself, nonetheless shows that the western section of the loop had become at least overgrown by osier bed.
It is slightly disconcerting because it is not orientated with North upwards, but turn it on its side clockwise and you get the more familiar picture.